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Joint Geological Survey/University of Cape Town MARINE GEOSCIENCE UNIT TECHNICAL ^REPORT NO. 13 PROGRESS REPORTS for the YEARS 1

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Joint Geological Survey/University of Cape Town MARINE GEOSCIENCE UNIT TECHNICAL ^REPORT NO. 13 PROGRESS REPORTS for the YEARS 1 Joint Geological Survey/University of Cape Town MARINE GEOSCIENCE UNIT TECHNICAL ^REPORT NO. 13 PROGRESS REPORTS FOR THE YEARS 1981-1982 Marine Geoscience Group Department of Geology University of Cape Town December 1982 NGU-Tfc—Kh JOINT GEOLOGICAL SURVEY/UNIVERSITY OF CAPE TOWN MARINE GEOSCIENCE UNIT TECHNICAL REPORT NO. 13 PROGRESS REPORTS FOR THE YEARS 1981-1982 Marine Geoscience Group Department of Geology University of Cape Town December 1982 The Joint Geological Survey/University of Cape Town Marine Geoscience Unit is jointly funded by the two parent organizations to promote marine geoscientific activity in South Africa. The Geological Survey Director, Mr L.N.J. Engelbrecht, and the University Research Committee are thanked for their continued generous financial and technical support for this work. The Unit was established in 1975 by the amalgamation of the Marine Geology Programme (funded by SANCOR until 1972) and the Marine Geophysical Unit. Financial ?nd technical assistance from the South African National Committee for Oceanographic Research, and the National Research Institute for Oceanology (Stellenbosch) are also gratefully acknowledged. It is the policy of the Geological Survey and the University of Cape Town that the data obtained may be presented in the form of theses for higher degrees and that completed projects shall be published without delay in appropriate media. The data and conclusions contained in this report are made available for the information of the international scientific community with tl~e request that they be not published in any manner without written permission. CONTENTS Page INTRODUCTION by R.V.Dingle i PRELIMINARY REPORT ON THE BATHYMETRY OF PART OF 1 THE TRANSKEI BASIN by S.H. Robson DISTRIBUTION OF BENTKIC OSTRACODS DURING THE 6 EMRLY SEPARATION OF SOUTHERN AFRICA AND THE FALKLAND PLATEAU by R.V. Dingle PRELIMINARY REPORT ON GEOCHEMICAL STUDIES OF 17 TUGELA RIVER MUDS CM THE DURBAN CONTINENTAL SHELF by T. Felhaber USING THE SCANNING ELECTRON MICROSCOPE AND 19 ENERGY-DISPERSIVE X-RAY SPECTROMETER TO DO MINERAL IDENTIFICATION AND COMPOSITIONAL POINT COUNTING ON UNCONSOLIDATED MARINE SEDIMENTS by S.H. Robson (Deleted) BASEMENT MORPHOLOGY AND UNCONSOLIDATED SEDIMENT 28 IN ALGOA BAY by J.M. 3renner and A. du Plessis GEOPHYSICAL INVESTIGATIONS IN l-ti*: VICINITY OF 37 PORT ELIZABETH HARBOUR by J.M. Bremner THE AGULHAS PLATEAU, SOUTH ATLANTIC OPENING AND 51 RIDGE-JUMPS SOUTH OF THE AGULHAS FALKLAND FRACTURE by A.K. Martin, C.J.H. Hartnady and D.B.Murray BATHYMETRY OF THE INNER SHELF ALONG THE CAPE WEST 6 4 COAST BETWEEN THE ORANGE RIVER AND PORT NOLLOTH by R.H. De Decker QUATERNARY SEDIMENTATION OF THE BOT RIVER LAGOON 72 by J. Rogers BEACH MORPHODYNAMICS IN RELATIONSHIP TO WAVE 97 ENERGY, GRAIN SIZE AND INTERNAL SEDIMENTARY STRUCTURE by B.W. Flemming PRELIMINARY MODEL OF SEDIMENT DISPERSAL BETWEEN 106 PORT ST JOHNS AND THE MSIKABA RIVER (SOUTHEAST AFRICAN CONTINENTAL MARGIN) by E.R. Hay PLEISTOCENE PHOSPHORITES OFF THE WEST COAST OF 122 SOUTH AFRICA by G.F. Birch XIV GUIDE TO THE SEDIMENTOLOGICAL USAGE OF THE 132 COULTER COUNTER MODEL TAII AT THE UNIVERSITY OF CAPE TOWN by F. Camden-Smith and A.K. Martin XV CONSOLIDATED LIST OF PUBLICATIONS OF THE MARINE 147 GEOSCIENCE GROUP (i) INTRODUCTION by R.V.Dir.gie Having been behind for several years with our "annual" reports, the current edition, which covers 1981-ir'82, will bring w: back on schedule so that the 1983 report will, hopefully, pertain only to 1983! During the period under review we bad several changes in personnel with the result that there have been, and will continue to be new- faces on the 5th floor of the Earth Sciences Building. In addition, new research projects and prospects have beer, opened up. I hope we have emerged from this unsettled phase and that 1983 will be a year of exciting expansion. The Geological Survey tear;; were most affected by loss of manpower: Dave Salmon in mid-1981 (micropalaeontology, to Anglo-American), Andre du Plessis at end of 1961 (geophysics, promotion to an Assistant Director in Pretoria), Gavin Birch in March 1982 (sedimenfology, to ESSO Australia) , ó.id Donne Murray in mid-1982 (geophysics, to commerce). Mike Bremner is now in charge of the GSO operation, and we hope to slowly re-build this side of our operation. In early 1981 we also lost Steve Goodlad to SOEKOR, and Keith Martin transferred to the NRIO staff, but stayed with us at UCT. Frances Camden-Smith has also left the shelter of the 5th iloor, but will continue to work on her Ph.D. thesis, which is eagerly awaited by the deep-sea researchers. To compensate for some of these losses we were joined by Simon Robson (early 1982) to work for his Ph.D., and welcomed back Dr John Rogers as SRO (early 1982). John was one of the originals when Professor Simpson started the SANCOR Marine Geology Unit in 1967, and had f:or the last 5 years been working for the G30 Bellville Office on (ii) West Coast Neogene sediments. Dave Salmon's, departure left us in bad shape with microplankton studies, but we have been very fortunate in being granted a SANCOR post-Doctoral Fellowship and acquiring the services of Dr Amos Winter from Stanford University who arrived in late 1982 on a three year contract. All this toing and froing has certainly caused disruption in our work programmes, but I think we will emerge stronger and perhaps better co-ordinated. The creation by UCT of the post of Sonnenberg Senior Research Officer in Marine Geoscience earlier this year gives us the opportunity to further strengthen our team. To summarize the current main research programmes: GSO Seismic and sediment studies on the inner continental shelf of Namaqualand (NW Cape); NRIO 1. Seismic and sediment studies on the Agulhas Bank. 2. Seismic, sediment and geochemical studies on the continental shelf along the east coast between Port Elizabeth and Mozambique; UCT 1. Seismic, sedimentological, geochemical, stratigraphic, and oceanographic studies on the contintental slope and deep-ocean basins off SE Africa. 2. Oceanic micropalaeontological studies off SE Africa. Overseas visits by members of our group during 1981-1982 included: Dr. B. W. Flemming; Joint Oceanographic Assembly, Halifax 1982 Dr. J. M. Bremner; Symposium on Oceanic Upwelling, Vila Moura, Portugal 1981. Prof. R. V. Dingle; Sabbatical leave to UK (4 months, Edinburgh and London University), and New Zealand (2 months sample collecting), 1981. > iii) Scientists and support personm in the Marine Geoscience Group at the end of 1982 UCT R.V.Cingle Professor of Marine Geoscience J.Rogers Senior Research Officer A.winter SANCOR post-Doctoral Fellow E.G.Mills Senior Technical Officer S.Robson UCT Scholar Mrs F.Camden-Smith UCT Scholar Miss J.Frewin UCT Scholar Miss E.R.Hay UCT Scholar Geological Survey J.M.Bremner Responsible Geologist R.De Decker Geologist P.Bova Geotechnician M.Woodborne Geologist National Research Institute of Ocear.ology B.W.Flemming Senior Research Officer A.K.Martin Research Officer Support Staff Mrs E.G.Krummeck (UCT) Secretary Mrs S.M.O.Sayers (GSO/UCT) Research Assistant Mrs S.N.Smith (GSO/UCT) Research Assistant Mrs h.Brandstatter (GSO/UCT) Research Assistant Mr H.Fortuin (NRIO) Research Assistant Mr M.Mahoney (UCT) Research Assistant Mr M.Smith (GSO/UCT) Research Assistant Mr V.Williams (GSO) Technical Assistant Mr R.O.Van Wyk (GSO) Technical Assistant (iv) Cruises undertaken by personnel in the Marine Geoscience Group 1. UCT R/V Thoaas B. Davie 1981 days 1982 days 424, 8/3-28/3 21 430, 20/8, 23/8 2 2. GSO Cruises on Seedelwer 1 SAD 4/81 4/5-25/5 22 SAD 4/82 19/4-26/5 38 SAD 9/82 6/9-22/9 17 3. NRIO R/V Meirinq Naude 81-01 19/1-30/1 12 82-4C 12/2-22/2 11 81-08 11/5-22/5 12 82-4E 2/3-10/3 9 81-11 29/6-10/7 12 82-05 29/3-2/4 5 81-19 9/11-20/11 12 82-11 19/5-27/5 9 82-21 17/10-22/10 5 70 117 1 I. PRELIMINARY REPORT ON THE BATHYMETRY OF PART OF THE TRANSKEI BASIN by S.H. Robson INTRODUCTION During cruise 424 of the R.V.Thomas B. Davie in March 1982 some 1405 nautical miles of bathymetric data were collected from the Transkei Basin with a 12 Khz ELAC echosounder. This equipment has a resolution of 10 metres per millimetre of paper in deep water (more than 1000 m). Navigation was by Decca Navigator with fixes taken at thirty minute intervals. As a back-up to Decca a Satellite Navigator was operated to calculate deed reckoning positions every fifteen minutes. Satellite fixes were obtained on average every seventy five minutes (with a range from eighteen to one hundred and twenty six minutes). The continental slope along the south eastern margin of South Africa is narrow (22 km off East London - 15 km off Port St Johns; Siesser, Scrutton and Simpson 1974) and steep (up to 15°). The gross morphology of the margin is the result of the north eastern edge of the Falkland Plateau sliding past the African coast as Africa and South America parted following strike-slip faulting approximately 127 m.y. B.P. The line along which the two continents separated is now marked by the Agulhas-Falkland Marginal Fracture Zone. This zone is defined by both a magnetic anomaly (Rabinowitz and LaBrecque 1979) and by a basement ridge which dams sediments and truncates pre-opening structures. Results and Discussion. From the bathymetric data collected on the cruise fair charts were produced and contoured.
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